Find parametric equation for ellipse

In summary, an ellipse is a geometric shape that resembles a flattened circle, defined as a set of points in a plane with a constant sum of distances from any point to two fixed points. A parametric equation for an ellipse uses two parameters <em>t</em> and <em>u</em> to describe the coordinates of points on the ellipse. To find the parametric equation, you can identify the center and lengths of the major and minor axes, choose values for <em>t</em> and <em>u</em>, and use specific equations. The parameters <em>t</em> and <em>u</em> represent the position of a point on the ellipse, and there are other ways to represent an
  • #1
getty102
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Homework Statement



Find parametric equation for (((x-2)^2)/4)+(((y+1)^2)/9)=1

Homework Equations



((x^2)/(a^2))+((y^2)/(b^2))=1 (ellipse equation)

The Attempt at a Solution



I tried solving for y which gave me y=(6/(x-2))-1, but that did not work.
 
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  • #2
hi getty10! :smile:

hint: an ellipse is a squashed circle

what parametric equation do you know for a circle? :wink:
 

What is an ellipse?

An ellipse is a geometric shape that resembles a flattened circle. It is defined as a set of points in a plane, such that the sum of the distances from any point on the ellipse to two fixed points (called the foci) is constant.

What is a parametric equation for an ellipse?

A parametric equation for an ellipse is a set of equations that describes the coordinates of points on the ellipse using two parameters, usually denoted as t and u. The equations are usually written in the form of x = f(t) and y = g(u), where f and g are functions that involve the parameters.

How do you find the parametric equation for an ellipse?

To find the parametric equation for an ellipse, you can use the following steps:

  1. Identify the center of the ellipse and the lengths of its major and minor axes.
  2. Choose a value for t that will be used to parameterize the x-coordinate of points on the ellipse.
  3. Use the equation x = a cos(t) to find the x-coordinate of points on the ellipse, where a is the length of the major axis.
  4. Choose a value for u that will be used to parameterize the y-coordinate of points on the ellipse.
  5. Use the equation y = b sin(u) to find the y-coordinate of points on the ellipse, where b is the length of the minor axis.

What is the role of t and u in a parametric equation for an ellipse?

The parameters t and u represent the position of a point on the ellipse relative to its center. By varying the values of t and u, you can generate a range of points that lie on the ellipse.

Are there any other ways to represent an ellipse mathematically?

Yes, there are other ways to represent an ellipse mathematically, such as using the general equation for an ellipse (x-h)^2/a^2 + (y-k)^2/b^2 = 1, where (h,k) is the center of the ellipse and a and b are the lengths of the major and minor axes, respectively. Another way is using the polar equation for an ellipse r = (ab)/√(a^2 sin^2θ + b^2 cos^2θ), where r and θ represent the polar coordinates of points on the ellipse.

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